Wave repeating system and apparatus



Dec i8, 1934. P. M. HAFFCKE WAVE REPEATING SYSTEM AND APPARATUS 2 Sheets-Sheet 2 Filed April 22, 1935 VENTOR WA; ma 6? 67K W .7 ATTORNE Patented Dec. 18, 1934 WAVE REPEATING SYSTEM APPARATUS Philip M. Haffcke, Dobbs Ferry, N. Y assignor to Radio Research Laboratories, Inc., New York, N. Y.,a corporation of Delaware Application April 22, 1933, Serial No. 667,358

Claims. (01. 179-171) UNITED ,STATES- PATENT, F IC This invention relates to wave repeating sys- Within the device 1.'- =For example apotential tems, and with particularity to systems employof the order of 200to 300 volts may be impressed ing vapor or gas repeater devices. upon the anode 6.

An object of the invention is to provide an im As indicated in, Fig. 1-. the positive terminal 5 proved form of wave repeating system employof the source of steady-potential'is'connected 5 ing a repeater device having a filling of a gas through the output coupling coil ,9 to the anode or vapor in conjunction with circuit arrange- 6. Whenthedevice 1 is to bewused as:a repeater ments for controlling the amount of regeneraof high frequency waves the coil 9 may be tion and/or sensitivity in the system. shunted by a tuning condenser 10, it beingun- 10 The invention is in the nature of an improvederstood however that the combination 9'-10 is 10 ment upon the type of system disclosed in 00- representative of anyone of a number ofknown pending application Serial No. 552,186, filed July ways of providing a" tuned output circuit.-

21, 1931. The cathode 2 is connected throng-ha current A feature of the invention relates to a wave generating resistance 11 to the negative terminal tube having at least five cold electrodes in controde 5 with respect to the 'CathOdd th Sa d junction with circuit arrangements for contro-lelectrode is connected by means of conductor 12 ling the regeneration effects of the system. through a choke coil 13 and a bias'resistance A further feature relates to the organization, 14 to the said cathode'2." Similarlygin order to arrangement and relative connection of elements bias the auxiliary electrode, 5 with respect to the 20 which go to make up an efficient and sensitive cathanode--3, the said electrode 5 isconnected by wave repeating system employing gas or vapor conductor 15 through the variable resistor 16. filled repeater devices. thence to-the inputcoil 17- to the cathanode 3; 7 Other features and advantages not specifical- Preferably the resistor 16 is provided with a byly enumerated will be apparent after a considpass condenser 18and the'coil l'lisshunted by a 2 5 eration of the following detail descriptions and tuning condenser 19, it. being understood that the appended claims; the combination 1'7-l91is merely symbolic of one Referring to the drawings, of a number of tunable input'circuits. One ter- Fig. 1 represents one typical form of waveree minal of this tuned input circuit is connected peater embodying features of the invention; by conductor 20 directly to the-control grid 4, 31)

Figs. 2 to 6 show respectively modifications of while the othenterminal isjtconnected by con-- the repeater ofFig. 1. ductor 21 to the cathanode 3. For the purpose Referring more particularly to- Fig. 1, the.-nu' of providing the properpotentialacross the elecv meral 1 indicates a device of the type disclosed trodes 2-and 3 the positiveterminal7 of the source iii-application Serial No. 552,186 and comprises of supply is connected through a voltage dividing 35- a bulb or envelope containing a filling of a gas, resistance 22 to the. cathanode- 3, and if desired vapor or other ionizable medium. Suitably thisresistancemay'be variable inorderto adjust mounted within the bulb are a series of elec-' the potentialof the electrode 3 "with'respect to trodescomprising a cold cathode 2, a foraminous the electrode 2. When the device of Fig. lie to. be

cathanode 3, a control electrode 4, an auxiliary used 3,5 3, high frequencyrep'eater it is not neces- 4O electrode 5 and an anode 6. As described in said sary to separately bias the control electrode 4 with application, the electrodes 2 and 3 are adapted respect to the cathanode'3. tohave a potential impressed thereacross sufli- As indicated in the drawings the'waves-to be cient to ionize the medium therebetween, and a repeated ar picked up by a suitable wave inrelatively i p te al is mp es d upon'the tercepting device such as an antenna 23 which anode 6 to accelerate the electrons from this is connected through acoupling coil 24 to ground. ionized Space towards and h ough the control The coils 24'and llmay constitute respectively electrode 4, and the auxiliary electrode 5 to the the. primary and'secondaryof any known type of space between this auxiliary electrode 5 and the high frequency coupling transformer. As indianode 6. For this purpose there is indicated cated schematically in the drawings the resistor 50 schematically in the drawings asuitable source of 16 is connected to the coil 1'7 by means of an steady potential having a positive terminal '7 and adjustable tap 26 so as to vary the reaction of a negative terminal 8. Preferably the source of the output circuit on the 1 input circuit. The potential connected to the terminals '7 and 8 is output coil 9 is coupled by means of the coupling 1 above the ionizing potential of the gas or vapor transformer, or other suitable coupling device 26,

# repeating system employing a gas or vapor filled, 8. For the purpose of biasing the auxiliary elcc- 15'- to a succeeding stage or stages (not shown). Preferably, although not necessarily the cathanode 3 is connected through a condenser 2'7 to the positive terminal 7. It has been found that by connecting the auxiliary electrode 5 to the input circuit through the variable resistor 16 and the condenser 13 the amount of regeneration in a system mayibe easily controlled; whereas in said prior application Serial No. 552,186 the auxiliary electrode 5 was connected directly to the cathanode 3 which tended to limit the regeneration in the system. Y

The manner of operation of the system of Fig. 1 will be apparent from the above description. Suffice it to say that because of the conductive filling in the tubes 1, the currents .in the output circuit tend to flow through the input circuit. By means of the variable tap 25 the ratio of feed back between the output--and,input circuits may be controlled at the same time that the desirable characteristics of :a tube such as disclosed in application .Serial No. 552,186 are attained.

lit "will be understood that the repeater of Fig. 1 may be used for audio amplification as well as for detection merely by providing the proper .bias between the control electrode 4 and the cathanode 3.

Referring to Fig. 2 there is shown a modification of the system 01 Fig. 1, like parts in these two figures being designated by the same numerals. The repeater of Fig. 2 differs from that of Fig. 1 in certain respects, namely the auxiliary electrode 5 is coupled to the input coil '1 inductively by means of a separate winding '28. Fig. 2 also shows the cathanodo 3 connected through the "resistor-condenser combination 29-30 and the coil 17. Instead of connecting the positive terminal 7 through condenser illto the cathanode, as in Fig. 1, Fig. 2 shows this positive terminal connected through condenser 27 directly to the control electrode 4. The functioning cl the system of Fig. '2 is substantially similar tothat of Fig. l, the extent of regeneration of the'system being controlled by the "inductive relation be-' tween the coils 28 and 17. It will also be noted that in the device of Fig. :2 the cathanode 3 is not connected conductively'to the negative terminal 8, but that the current return forthe cathanode 3 to the negative terminal 8 is elliected through the conductive medium between the electrodes 2 and i Fig. 3 shows a system susbstanitia'lly'the same as that of Fig. 1 withthe additional provision of a biasing arrangement comprising a pbtentiameter 31 and a battery 32 for staticallybiasing the control electrode 4 with-respect to -the cathanode 3. In other respects the system of .l'iig. 3 functions the same as that 0! Fig.1.

Referring to Fig; 4 there shown a-modification of the system of Fig.- 1, wherein the auxiliary.

electrode 5 instead of being connected through the variable resistor 15 to an intermediate point on the coupling 'coil 17, is connected to the oathanode 3. In other respects the device of 4 operates substantially the same as that of 1. It is to be noted'however that in the system of Fig. 4 the extent of reseneraion :is very small be-v resistance 16, as well as by the variable tap 25 to-the input coil 17. The static bias of the control electrode .5 with respect to the cathode 2 is provided by theresistance 33 in series with a suitable choke coil 34. 'The return for the output currents is provided from the point 25 to the positive terminal "7 through the resistance 29 :and condenser 30 as described in connection with Fig. 2. It is believed that further description of the operation of Fig. 6 is not necessary at this point. r

What is claimed is:

.1. in combination awaverepeater device having a stilling of run ionizable medium, a cathode, a cathode, a control grid and an auxiliary grid, a signal input :circuit said device, a signal output circuit "for said device, :and variable impedance means. between said auxiliary grid and said input circuit :for controlling the extent of regeneration of the waves repeated through said device.

2.,In combination a wave repeater device .having a filling of an ionizaole medium, a cold cathode, 1a nathanode, a control electrode, an auxiliary electrode and an anode within said device, an input circuit connected across :said control electrode and said icathanode, a connection from said auxiliary electrode to a point intermediate 5. In combination a wave repeating device having a filling of an 'ionizable medium, at least five cold electrodes within said device, said electrodes including a coldcathode, a control electrode, an auxiliary electrode and an anode, a sourceof potential connected across said cathode and anode, a signal input coil connectedto said control grid, a connection from said control grid to the positive terminal of said source, and means connecting said control EH30.

trode and said auxiliary electrode for inductively supplying to said input coil energy derived from the repeated signals.

- PHILIP M. HAEFCKE. 

